Some files I can't save (permissions on 10.7.4)

I can save TextEdit files OK, but I cannot save Pages or Photoshop files anymore. Very odd. The message I get is that I don't have the right permissions. But I am the administrator and have all Read and Write permissions in Prefs. I also did APPLY TO ENCLOSED ITEMS in the Home folder info. Then I restarted the iMac. MacOS 10.7.4. Worked fine until just now. Nothing doing. Still can't save Pages or Photoshop... All this on the internal drive. But I can save TextEdit files... How do they get through the permissions problem?

The only new element on the system side is that I did a migration to my new MacBookPro, and was asked to change the name of the computer. It wasn't too clear, but it meant the MacBook Pro's name I assume (since two computers can't have the same name). But did I change the iMac's name by mistake? Ist this why I now have this mess?

In System Preferences/Sharing, my computer is named "LaurentsiMac".

In System Preferences/Users, I am "Laurent Sauerwein" and I'm the administrator.

In the Home folder Info Box, I am named "laurentsauerwein (me)" with Read & Write permissions.

Does that make sense?

I did in Terminal what Linc Davis suggests in another discussions: ls -AOel ~

And here is what I get:

Last login: Wed Jul 11 18:12:32 on console

LaurentsiMac:~ laurentsauerwein$ ls -AOel ~

total 536

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 3 Nov 3 2007 .CFUserTextEncoding

-rw-r--r--@ 1 laurentsauerwein laurentsauerwein hidden 43012 Jul 12 01:39 .DS_Store

drwxr-xr-x 4 laurentsauerwein laurentsauerwein - 136 Jul 12 2009 .DownloadManager

drwxr-xr-x 2 laurentsauerwein laurentsauerwein - 68 Jul 11 18:13 .Trash

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 0 Jul 30 2008 .Xauthority

drwxr-xr-x 2 laurentsauerwein laurentsauerwein - 68 Jul 20 2008 .Xcode

drwxr-xr-x 4 laurentsauerwein laurentsauerwein - 136 Jul 3 2011 .adobe

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 14869 Jun 24 19:46 .bash_history

drwxr-xr-x 33 laurentsauerwein laurentsauerwein - 1122 Nov 10 2009 .calibre-fontconfig

drwxr-xr-x 3 laurentsauerwein laurentsauerwein - 102 Apr 12 2008 .cups

drwx------ 14 laurentsauerwein laurentsauerwein - 476 Jul 11 18:14 .dropbox

drwxr-xr-x 22 laurentsauerwein laurentsauerwein - 748 Sep 13 2011 .dvdcss

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 28 Jan 25 2007 .eno

drwxr-xr-x 29 laurentsauerwein laurentsauerwein - 986 Feb 28 2010 .fontconfig

drwxr-xr-x 14 laurentsauerwein laurentsauerwein - 476 Oct 4 2009 .fonts

-rwxr-xr-x 1 laurentsauerwein laurentsauerwein - 17 Nov 4 2003 .jalbum-defaults.jap

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 49 Oct 24 2004 .jalbum-recent-projects.properties

drwxr-xr-x@ 2 laurentsauerwein laurentsauerwein - 68 Aug 17 2004 .java

drwxr-xr-x 15 laurentsauerwein laurentsauerwein - 510 Nov 22 2005 .jbidwatcher

drwxr-xr-x@ 4 laurentsauerwein laurentsauerwein - 136 Feb 8 2004 .jpi_cache

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 1024 Nov 16 2008 .rnd

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 16 Feb 14 00:12 .vbt5

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 538 Jul 13 2009 Adobe CS4 Installer Database removal application.log

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 66819 Mar 16 16:28 Adobe CS5 Cleaner Tool.log

-rw-r--r--@ 1 laurentsauerwein laurentsauerwein - 59440 Aug 11 2005 Adobe SVG 3.0 Installer Log

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 8420 Jul 20 2009 AdobeCS3Clean.log

drwxr-xr-x 7 laurentsauerwein laurentsauerwein - 238 Jul 13 2009 AdobeLicensingFilesBackup

drwxr-xr-x 3 laurentsauerwein laurentsauerwein - 102 Jul 10 09:17 Applications

drwxr-xr-x 15 laurentsauerwein laurentsauerwein - 510 Mar 4 2010 Calibre Library

drwx------@ 68 laurentsauerwein laurentsauerwein - 2312 Jul 11 18:15 Desktop

drwx------@ 89 laurentsauerwein laurentsauerwein - 3026 Jun 27 16:53 Documents

drwx------ 4 laurentsauerwein laurentsauerwein - 136 Jul 10 11:35 Downloads

drwxr-xr-x@ 42 laurentsauerwein laurentsauerwein - 1428 Jul 11 18:14 Dropbox

drwxr-xr-x 9 laurentsauerwein laurentsauerwein - 306 Mar 25 2007 Incomplete

drwx------@ 86 laurentsauerwein laurentsauerwein hidden 2924 Jul 11 18:13 Library

drwxr-xr-x 3 laurentsauerwein laurentsauerwein - 102 Feb 12 2006 Magazines

drwx------@ 15 laurentsauerwein laurentsauerwein - 510 Mar 12 18:46 Movies

drwx------@ 15 laurentsauerwein laurentsauerwein - 510 May 13 18:19 Music

drwx------@ 482 laurentsauerwein laurentsauerwein - 16388 Jul 7 18:03 Pictures

d---------@ 5 laurentsauerwein laurentsauerwein - 170 Nov 20 2005 Public

0: user:laurentsauerwein allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextat tr,writeextattr,readsecurity

1: group:laurentsauerwein allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextat tr,writeextattr,readsecurity

2: group:everyone allow list,add_file,search,add_subdirectory,delete_child,readattr,writeattr,readextat tr,writeextattr,readsecurity

drwxr-xr-x 3 laurentsauerwein laurentsauerwein - 102 Mar 25 2007 Shared

drwxr-xr-x@ 8 laurentsauerwein laurentsauerwein - 272 Aug 30 2004 Sites

drwxr-xr-x 5 laurentsauerwein laurentsauerwein - 170 Feb 26 2007 cfx

drwxr-xr-x 2 laurentsauerwein laurentsauerwein - 68 May 11 2011 dwhelper

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 29271 Aug 14 2007 istockphoto_1426176_chocolate_bar.jpg

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 7 Feb 8 2006 loc.txt

-rw-r--r-- 1 laurentsauerwein laurentsauerwein - 57 May 17 2004 {guest}-chat.properties

Does that give anyone a clue to what's going on? For the moment, I can't do any work on the iMac.

Thanks for help! — Laurent in Berlin

iMac (27-inch Mid 2011), Mac OS X (10.7.4)